With measuring tape.
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length X width x height
That depends on the shape you want to measure. For example, if it's rectangular, you measure length and width, and multiply.
To calculate the area of a rectangle :- Measure the length. Measure the width. Multiply the length by the width - the product is the area. EXAMPLE : length = 7 inches, width = 3 inches, Area = 7 x 3 = 21 square inches.
length and width
If you assume a rectangular building, you measure the length and the width (in feet, in this case), and multiply.